I got a 50000 mAh external battery for it. I wanted a slightly larger glass without much weight. I haven't run it for a full bank cycle yet, but I'm guessing 2 hours. I probably should have gotten a size smaller. It would have created a better seal, maybe better airflow around my face. I got this vest for a job where it can get up to 130Β°F+ with no air movement (still waiting to test it out there). Some people have vests with ice packs and need to chill the bags in the freezer. Thought I'd give it a try and hope it suits my needs.
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